Odpowiedzi

2010-04-12T17:32:51+02:00
1.{1/3x+2y+1=0 / *(-3)
{y+x-2=0

{-x-6y-3=0
{x+y-2=0
-_____________
-5y=-6 /:(-5)
y=5/6


2010-04-12T17:46:30+02:00
{1/3x+2y+1=0
{y+x-2=0
{y=2-x
{1/3x+2(2-x)=-1
1/3x+2x=-5
7/3x=-5
x= - 15/7
y=2-(-15/7)
y=29/7
{y=4 i 1/7
{x=-2 i 1/7


{2,5x+0,2y-2,8=0
{x+1/6y-1.6=0
{x=1.6+1/6y
{2,5(1,6+1/6y)+0,2y=2,8
16/6y+0,2y=2,8-4
172/60y=-12/10
y=-36/86
x=1,6+1/6(-36/86)
x=1,6-6/86
{x=1 i 516/860
{y=-36/86


{0,5x-0,25y=4
{0,25x+y=7
{y=7-0,25x
{0.5x-0,25(7-0,25x)=4
0,5625x=5,75
x=575
y=7-0,25*575
{y=-136,75
{x=575